/*
 *  Copyright(C) 2006 Cameron Rich
 *
 *  This library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/**
 * @file os_port.c
 *
 * OS specific functions.
 */
#include <time.h>
#include <stdlib.h>
#include <errno.h>
#include <stdarg.h>
#include "os_port.h"

#ifdef WIN32
/**
 * gettimeofday() not in Win32 
 */
EXP_FUNC void STDCALL gettimeofday(struct timeval* t, void* timezone)
{       
#if defined(_WIN32_WCE)
    t->tv_sec = time(NULL);
    t->tv_usec = 0;                         /* 1sec precision only */ 
#else
    struct _timeb timebuffer;
    _ftime(&timebuffer);
    t->tv_sec = (long)timebuffer.time;
    t->tv_usec = 1000 * timebuffer.millitm; /* 1ms precision */
#endif
}

/**
 * strcasecmp() not in Win32
 */
EXP_FUNC int STDCALL strcasecmp(const char *s1, const char *s2)
{
    while (tolower(*s1) == tolower(*s2++))
    {
        if (*s1++ == '\0')
        {
            return 0;
        }
    }

    return *(unsigned char *)s1 - *(unsigned char *)(s2 - 1);
}

#endif

#undef malloc
#undef realloc
#undef calloc
#undef open
#undef fopen

static const char * out_of_mem_str = "out of memory";
static const char * file_open_str = "Could not open file \"%s\"";

/* 
 * Some functions that call display some error trace and then call abort().
 * This just makes life much easier on embedded systems, since we're 
 * suffering major trauma...
 */
EXP_FUNC void * STDCALL ax_malloc(size_t s)
{
    void *x;

    if ((x = malloc(s)) == NULL)
        exit_now(out_of_mem_str);

    return x;
}

EXP_FUNC void * STDCALL ax_realloc(void *y, size_t s)
{
    void *x;

    if ((x = realloc(y, s)) == NULL)
        exit_now(out_of_mem_str);

    return x;
}

EXP_FUNC void * STDCALL ax_calloc(size_t n, size_t s)
{
    void *x;

    if ((x = calloc(n, s)) == NULL)
        exit_now(out_of_mem_str);

    return x;
}

EXP_FUNC FILE * STDCALL ax_fopen(const char *pathname, const char *type)
{
    FILE *f; 

    if ((f = fopen(pathname, type)) == NULL)
        exit_now(file_open_str, pathname);

    return  f;
}

EXP_FUNC int STDCALL ax_open(const char *pathname, int flags)
{
    int x;

    if ((x = open(pathname, flags)) < 0)
        exit_now(file_open_str, pathname);

    return x;
}

/**
 * This is a call which will deliberately exit an application, but will
 * display some information before dying.
 */
void exit_now(const char *format, ...)
{
    va_list argp;

    va_start(argp, format);
    vfprintf(stderr, format, argp);
    va_end(argp);
    abort();
}